松辽盆地齐家-古龙凹陷青山口组深水细粒沉积体系的微相类型及其页岩油气勘探意义  

Sedimentary microfacies of deepwater fine-grained depositional system and its significance for shale oil and gas exploration in Qingshankou Formation, Qijia-Gulong depression, Songliao Basin, Northeast China

作　　者：陈彬滔[1,2] 潘树新[1,2] 王天奇[1,2] 张庆石 梁苏娟[1] 刘彩燕[1] 

机构地区：[1]中国石油勘探开发研究院西北分院,甘肃兰州730020 [2]中国石油天然气集团公司油藏描述重点实验室,甘肃兰州730020 [3]中国石油大庆油田分公司勘探开发研究院,黑龙江大庆163000

出　　处：《中南大学学报（自然科学版）》2015年第9期3338-3345,共8页Journal of Central South University:Science and Technology

基　　金：中石油股份公司重大专项(2012E-2603-01)~~

摘　　要：为了厘清陆相湖盆深水区的沉积微相类型及其对页岩油气勘探区带优选的影响,对松辽盆地齐家—古龙凹陷青山口组泥页岩区进行精细岩心观察、测井分析、高分辨率三维地震解释、全岩光片显微组分测定、氩离子抛光-场发射扫描电镜微观孔隙研究。研究结果表明:研究区深水细粒沉积体系可划分出油页岩、深湖泥、底流改造砂、介壳滩、浊积以及块体搬运体共6种沉积微相。沉积微相与有机质赋存状态、储集空间类型以及油气富集类型之间具有良好的相关关系。油页岩和深湖泥微相的储集空间类型以有机质孔、黏土矿物粒间孔、自生黄铁矿颗粒间孔、微裂缝为主,属于基质型油气富集类型;介壳滩、底流改造砂、浊积微相属于夹层富集型油气富集类型,是页岩油气勘探的有利目标;块体搬运体微相属于孔隙富集型油气富集类型。In order to clarify the types of sedimentary microfacies in deepwater area of terrestrial lacustrine basin and its affection towards shale gas oil exploration, the following measurements and analysis were carried out in the shale area of Qingshankou Formation in Qijia—Gulong depression, Songliao Basin： fine core observation, well logging analysis, interpretation of high resolution 3D seismic data, determination of whole core macerals, and argon ion polishing-field emission scanning electron microscope pore research. The results show that deepwater fine-grained depositional system can be divided into six sedimentary microfacies, including oil shale, deepwater mud, bottom current rework sand（BCRS）, shelly beach, turbidite, and mass transport deposits（MTD）. Good correlation is found between sedimentarymicrofacies and the occurrence of organic matter, reservoir space types, and hydrocarbon accumulation types. Reservoir space types of oil shale and deepwater mud are dominated by organic matter pores, intergranular pores between clay minerals, intergranular pores between authigenic pyrite, and microfractures, which belong to matrix-dominated hydrocarbon accumulation. Shelly beach, BCRS and turbidite microfacies are interlayer-dominated hydrocarbon accumulation, which are the favorable targets of shale gas and oil exploration. MTD are pore-dominated hydrocarbon accumulation.

关 键 词：深水细粒沉积 页岩油气 沉积微相 底流改造砂 块体搬运体 青山口组 

分 类 号：TE122.1[石油与天然气工程—油气勘探]